64256666405 has 32 divisors (see below), whose sum is σ = 79427174400. Its totient is φ = 49880008000.

The previous prime is 64256666401. The next prime is 64256666417. The reversal of 64256666405 is 50466665246.

It is not a de Polignac number, because 64256666405 - 2² = 64256666401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64256666401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13387196 + ... + 13391994.

It is an arithmetic number, because the mean of its divisors is an integer number (2482099200).

Almost surely, 2^64256666405 is an apocalyptic number.

It is an amenable number.

64256666405 is a deficient number, since it is larger than the sum of its proper divisors (15170507995).

64256666405 is a wasteful number, since it uses less digits than its factorization.

64256666405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5329.

The product of its (nonzero) digits is 6220800, while the sum is 50.

The spelling of 64256666405 in words is "sixty-four billion, two hundred fifty-six million, six hundred sixty-six thousand, four hundred five".